flz-failsafe-tech
ESC PROGRAMMING and FAILSAFE
TECHNICAL NOTICE
FAILSAFE SETTING
IMPORTANT: Before installing the propeller, it’s 
important for safety reasons to ensure that the 
failsafe on the receiver is at the 0% throttle preset 
position as indicated in the instructions below.
 1.   Install the AA batteries into the transmitter.
 2.  Make sure the throttle 
stick is in the minimum 
position or 0% throttle.
 3.   Make sure the servo 
reversing switch for 
CH3 Throttle (located 
on the front of the 
transmitter) is in the 
“R” position.
 4.   Power on the transmitter.
 5.   Plug in the battery to 
the aircraft.
 6.   Press the LINK button 
on the TR624 receiver 
and hold for 2 seconds. 
The red LINK light should 
blink and then stay on.
The failsafe is now set. In 
the event that the receiver 
loses signal from the transmitter the throttle will revert to 0%. 
If you would like to set the failsafe to a different position, refer 
Throttle stick is in
the minimum position!
to the instructions below. Always remove the propeller 
from the aircraft before adjusting the failsafe.
FAILSAFE FUNCTION
The included Tactic TR624 receiver has a failsafe feature 
which engages in the event that the radio signal from the 
transmitter is interrupted. If radio contact is broken, this safety 
feature causes the servos to automatically move either to 
a certain position, or hold their last position to prevent the 
model from moving in an erratic manner. Channels 1, 2, 4, 
5, and 6 will enter a “hold” mode, whereby the servos will 
lock in their last recognized position.
The servo or ESC connected to Channel 3, normally being 
the throttle control, will move to a pre-set position. The 
factory default failsafe position for Channel 3 is to move 
to  0% throttle. Motor/prop movement should stop if the 
receiver loses signal from the transmitter. The throttle 
servo’s failsafe position can be manually re-set to any other 
position if desired, as follows:
IMPORTANT NOTE: Before manually resetting the failsafe, 
make sure the servo reversing switches are in the correct 
position for the application and the propeller is removed.
 1.  Apply power to the Tx and Rx.
 2a. If using an ESC, do NOT arm the ESC. Do NOT attempt to 
adjust the throttle’s failsafe position if the ESC is armed.
 2b. If using a gas or glow powered engine, do NOT attempt 
to adjust the throttle’s failsafe position while the engine 
is operating.
 3.  Move the Tx throttle stick to the desired position for the 
throttle control to move if the Rx goes to failsafe.
 4.  Press and hold the LINK button on the receiver, and the 
Rx’s LED should blink twice. Release the LINK button, 
and the receiver’s LED should turn on (stop  ashing). The 
Tx and Rx should now be linked, with the throttle failsafe 
in the new position as set above.
NOTE: If you replace the ESC with a different ESC which 
has a signal loss feature, the pre-set failsafe position is 
irrelevant as the signal loss feature will cease the throttle 
operation if the signal is lost.
OPERATION / STARTUP
 1.  When powering up the model to run the motor or  y, 
always lower the throttle stick and turn on the transmitter 
 rst before connecting the battery to the ESC (similarly, 
always disconnect the battery from the ESC before turning 
off the transmitter).


